The Biggest Animals Kingdom and in The World | Chicken | Chickens are omnivores. More old world chicken, a hen, died of a heart attack at 16 years old, according to the Guinness Book of Records. Roosters can usually be differentiated from hens by their striking plumage of long flowing tails and shiny feathers, neck edge (IRE) and value (saddle) which are typically bright and vibrant colors than females of the same species. However, in some breeds, such as the Sebright, the rooster is slightly pointed neck feathers, the same color as the hen. Adult chickens have a fleshy crest on their heads called a comb or cockscomb, and hanging flaps of skin on each side with their beaks called wattles. The sleeve or beard is a mutation found in several breeds of chickens that causes blur on the face of extra chicken, giving the appearance of a beard.
Chickens may occasionally fly briefly to explore their surroundings, but generally do so only to flee perceived danger. Chickens are gregarious birds and live in groups. Individual chickens in a flock dominate others, establishing a "pecking order", with dominant individuals have priority of access to food and nesting sites. Adding chickens and a flock of birds exists can lead to violence and injuries. Chickens try to put in nests that already contain eggs, and have been known to move eggs from nests on their own neighbors. If the nest is small, or determined from chickens in particular, this can lead to chickens that attempt to put each other. Roosters crowing (a loud, sharp sometimes called) is a territorial signal to other roosters. Hens cluck loudly after laying an egg, and also to call their chicks. Chickens also give a "warning call" when they think bass see an approaching predator.
John Fallon, the overseer of the project, stated that chickens have maintained the ability to make teeth, under certain conditions When a rooster finds food, he may call other chickens to eat first. To start dating, some roosters may dance in a circle around or near a hen ("a circle dance"), often lowering his wing closest to the hen. The dance triggers a response in the female brain, and when the hen responds to his "call", the rooster may mount the hen and proceed with the fertilization. Chickens raised for eggs are called laying hens. Some breeds of hens can produce over 300 eggs per year, "the highest rate of oviposition is 371 real eggs in 364 days. In the UK and Europe, laying hens are then slaughtered and used in processed foods, or sold as "chicken soup.
In 2000, there were 50.4 million tonnes of eggs produced in the world (executive guide to trends in birds in the world, 2001) and an estimated 53.4 million tons of table eggs were produced in 2002. During 2009, approximately 62.1 million tons of eggs were produced worldwide by a herd of about 6,400 stalls million chickens. Chicken eggs are widely used in many types of dishes, both sweet and savory, like many roasts. Eggs can be scrambled, fried, baked, boiled, pickled, and poached. The egg white, or egg white protein, but contains little or no fat, and can be used for cooking separately from the yolk. Hens do not need a man to produce eggs, fertilize only. A batch containing only women continue to produce eggs, but the eggs will all be sterile.
Some people find the behavior of chickens fun and educational. An unusual variety of chicken that has its origins in South America is the araucana, bred in southern Chile by Mapuche people. In 2007, an international team of researchers published the results of analysis of chicken bones found on the Arauco Peninsula in south central Chile. Radiocarbon dating suggested that the chickens were Pre-Columbian, and DNA analysis showed that they were related to prehistoric populations of chickens in Polynesia. These results seem to confirm that the chickens came from Polynesia and that there were transpacific contacts between Polynesia and South America before Columbus's arrival to America. Modeling of the potential marine carbon contribution to the Chilean archaeological specimen casts further doubt on claims for pre-Columbian chickens, and definitive proof will require further analyzes of ancient DNA sequences and radiocarbon and stable isotope data from archaeological excavations Chile and Polynesia
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